I think once your grandmother knows it's ironic or your favorite corporate entity, it is time to hang it up. Now I'll say, I'm not a fan of the irony thing in general, but I can respect the appropriate use of cheese. These things have been overused enough that their ironic value—their wink, wink, nudge nudge is no longer all that amusing. If they are to be used at all, they must be something you straight up like and you need to accept that shit.